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That question is far to general to accurately help you. That game, you may have realized, wasn't likely very easy to create. You'd have to have skills in both sever-side and client-side — so users can register and actually play the game, respectively. You simply cannot learn how to create something like that overnight. I'd suggest first learning JavaScript; start with the simple stuff, work your way onto the more complex stuff. Then learn a server-side language like PHP; learn how the language works, and then specifically how to create some kind of user system in which will most likely involve databases. There are already a lot of open-source PHP scripts that involve this, and thus, you could look through their code to see exactly how they work. Same thing for any JavaScript — think it's cool? Check out the source. What better way to learn than by example? I've also listed some excellent resources here which should help you learn JavaScript and PHP.